Mineralogy,geochemistry, and genesis of high-alumina fenites of the Mont Saint-Hilaire alkaline pluton,Québec,Canada |
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| Authors: | O S Yakovleva I V Pekov L Horváth I A Bryzgalov V O Yapaskurt E V Guseva |
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| Institution: | 1.Faculty of Geology,Moscow State University,Moscow,Russia;2.Institute of Geochemistry and Analytical Chemistry,Russian Academy of Sciences,Moscow,Russia;3.Hudson Heights,Canada |
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| Abstract: | High-alumina fenites in the Mont Saint-Hilaire alkaline complex, Québec, Canada, form bodies at the contact of peralkaline
nepheline syenite. Fenites are subdivided into four types: corundum-spessartine-biotite-feldspar, muscovite-corundum-hercynite-biotite-feldspar,
carbonated muscovite-biotite-hercynite-feldspar, and spessartine-hercynite-feldspar. Accessory minerals of the ilmenite-pyrophanite
series, columbites, zircon, thorite, pyrrhotite, Fe, Mn, Mg, Ca, Ba, and REE carbonates, uedaite-(Ce), etc. are identified.
Three stages are suggested in the formation of these rocks. In mineralogy and geochemistry, the Mont Saint-Hilaire high-alumina
fenites are similar to Al-rich fenites replacing xenoliths in the Khibiny alkaline complex, Russia. In both cases, fenites
are related to peralkaline rocks and replace high-alumina protoliths: granite at Mont Saint-Hilaire and metapelites in the
Khibiny Mountains. These fenites are regarded as a specific type of fenites with rock-forming Mg-depleted hercynite. |
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